Messages in this thread | | | Date | Fri, 05 Oct 2018 18:05:01 +0300 | Subject | Re: [PATCH] memblock: stop using implicit alignement to SMP_CACHE_BYTES | From | Mike Rapoport <> |
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On October 5, 2018 6:25:38 AM GMT+03:00, Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote: >On Fri, 2018-10-05 at 00:07 +0300, Mike Rapoport wrote: >> When a memblock allocation APIs are called with align = 0, the >alignment is >> implicitly set to SMP_CACHE_BYTES. >> >> Replace all such uses of memblock APIs with the 'align' parameter >explicitly >> set to SMP_CACHE_BYTES and stop implicit alignment assignment in the >> memblock internal allocation functions. >> >> For the case when memblock APIs are used via helper functions, e.g. >like >> iommu_arena_new_node() in Alpha, the helper functions were detected >with >> Coccinelle's help and then manually examined and updated where >appropriate. >> >> The direct memblock APIs users were updated using the semantic patch >below: > >What is the purpose of this ? It sounds rather counter-intuitive...
Why? I think it actually more intuitive to explicitly set alignment to SMP_CACHE_BYTES rather than use align = 0 because deeply inside allocator it will be implicitly reset to SMP_CACHE_BYTES...
>Ben.
-- Sincerely yours, Mike.
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